Process for the manufacture of a sulfureted vat dye of the anthracene series.



BERTRAM MCAYER AND LEOPOLD NEIL,

SOCIETY OF CHEMICAL INDUSTRY PROCESS F03 THE OF BASEL, S'WITZERLAND,ASSIGNORS TO IN BASLE, 0F BASEL, SWITZERLAND.

MANUFACTURE OF A SULFURETED VAT DYE OF THE ANTHEACENE seems,

No Drawing.

Specification of Letters Patent. Application filed Au ust 3, 1911.

Patented Nov. 19, 1912., Serial No. 642,1341.

To all whom it may concern:

Be it known that we, Bnn'rugnr h IAYER, doctor of philosophy andchemist, a subject of the King of Bavaria, and LEoPoLo Winn.

vdoctor of philosophy and chemist, a subject of the Grand Duke of Baden,residents of Basel. Switzerland, have 'invented a new. Process for theManufacture of a Sulfureted VatDye of the Anthracene Series, of

which the following is a full. clear, and eX-' act specification.

In the United States Letters Patent 927,868 is described a blue-greendyestutt' obtained by heating niethylbenzanthrone melting at 199 C. withsulfur'to ZOO-240 C. The same'blue-green vat dyestuff, but

.dyeing considerably clearer tints and being in a purer crystalline formis obtained, when the sulfuration is effected in the presence of adiluent, as for instance naphthalene, in a reflux apparatus. Theresulting crystallized sulfurized dyestufi' corresponds probably to theformula s -\;U lA

* 1 l (lot l The following example illustrates the invention: 7

Example I: throne (melting gether parts ofnaphthalene for 25 hours in areflux-apparatus, the mixture being kept boilin'g.- The still Warmliquid mass is filtered and the solid matter is Washed with hot 20 partsof niethylbenzanpoint 199 C.) are heated toxj lene, whereby the dyestuifis left in a sat isfactory pure condition in the form of small crystalsshowing after trlturatlon a vivid copper-y luster. It dissolves inconwith 20 parts of sulfur and 10d cent-rated sulfuric acid with abrownwioletcoloration and 1s insoluble in glacial acetic acid, alcoholand toluene. In boiling nitrobenzene or boiling chloronaphthalene itdissolves only in small quantities giving a blue. solution having amoss-green fluorescence. lVith caustic soda lye and hydrosulfite thedyestutl' yields a' violet-blue vat which dyes cotton pure blue tintspassing after exposure to air and soaping to a pure intense, blue-greenof excellent fastness. The same dyestuff is obtained, when in theforegoing example the niethylbenzanthrone is replaced by its specifiednitroor halogen derivat-ives.

lVhat we claim is:

1. The described process for the menu fac-ture of new sulfureted vatdyestuffs of the anthracene series, which consists in heating aniethylbenzanthrone compound with sulfur to a high temperature, inpresence of a diluent.

2. The described process for the manufacture of a new sulfurcted vatdyestuif of the anthracene series, which consists in heatingniethylbeuzanthrone melting at 199 C. with sulfur to a highten'iperature in presence of a diluent.

The described process for the manufacture of a new siilfureted vat dvestutf of the anthracene series, which consists in heatingmethylbenzanthrone melting at 199 C. with sulfur to a high temperaturein presence of naphthalene 1n witness whereof we have hereunto signedour names this 25th day of July 1911, in the presence oftwo subscribingwitmesses.

v BERTRAM MA.YER. LEOPOLD WElL. Witnesses Gnonon Grrrono, HANSTREFZGER'.

